python之无法在django中下载文件

我是 django 的新手，我开发了一个 django 网站，人们可以通过输入书名来下载 epub 文件。我已经检查了关于下载的 django api，代码似乎工作正常(没有错误报告)，但是我的浏览器没有弹出下载窗口。我在 127.0.0.1:8000 上测试，这是我的部分代码

View .py

def download(request, file_path, book_name): 
    if os.path.exists(file_path): 
        response = HttpResponse(content_type="application/epub+zip") 
        response['X-Sendfile'] = file_path 
        response['Content-Disposition'] = 'attachment; filename=abc.epub' 
        print (response) 
        return response 
    raise False 

根据我的控制台，它可以找到文件路径，并通过打印它显示的消息

<HttpResponse status_code=200, "application/epub+zip"> 
[26/Mar/2018 18:31:03] "POST / HTTP/1.1" 200 509 

似乎一切正常，只是下载窗口没有弹出。有谁知道哪里出了问题？谢谢!

========== 补充: 为了让您全面了解 View 文件，下载是通过索引调用的，仅此而已:

def index(request): 
    template = loader.get_template('index.html') 
    book_name = '' 
    result = '' 
    if request.method == "POST": # check if user actually type a book name 
        book_name = request.POST.get("book_name") 
    cwd = os.getcwd() 
    if book_name != '': # search and create are functions from other file which would create an epub file and put it in current directory 
        result = search.search_ask(book_name) 
        create.create(book_name) 
 
        file_path = os.path.join(cwd, book_name) + '.epub' 
        download(request, file_path, book_name) 
 
    context = {'return_value': book_name, 
               'result_1': result, 
               'cwd': cwd} 
 
    return HttpResponse(template.render(context, request)) 

请您参考如下方法:

您不返回下载方法返回的响应对象。大多数是:

return donwload(request, file_path, book_name) 

或

download_response = donwload(request, file_path, book_name) 
if download_response: 
    return download_response 
else: 
    # not found or other return. 

在你的代码中总是返回

return HttpResponse(template.render(context, request))